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Abstract

A method is described which provides an algorithm for controlling the escapement mechanism of a printer. The algorithm disclosed is based on the use of a "shaping filter" to derive the algorithm profile. The shaping filter provides the unique structure to the profile necessary for compensation of unwanted escapement system dynamic characteristics. The shaping filter is developed from an approximate model of the system. The model may be as simple or as complex as is necessary to adequately describe the system's response to an input command. The model need not include all dynamic modes of the system but only those modes which significantly alter the desired input-output relationship. The model may be obtained either analytically or empirically.

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United States

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English (United States)

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Escapement Control Algorithm for Printers Based on a Shaping Filter
Profile

A method is described which provides an algorithm for controlling the
escapement mechanism of a printer. The algorithm disclosed is based on the use
of a "shaping filter" to derive the algorithm profile. The shaping filter provides the
unique structure to the profile necessary for compensation of unwanted
escapement system dynamic characteristics. The shaping filter is developed from
an approximate model of the system. The model may be as simple or as
complex as is necessary to adequately describe the system's response to an
input command. The model need not include all dynamic modes of the system
but only those modes which significantly alter the desired input-output
relationship. The model may be obtained either analytically or empirically. An
empirical model can be developed using a number of techniques including both
time response and frequency response methods. To insure accurate model
characterization, the preferred approach is to use a combination of analytical and
empirical analyses. For discussion purposes, the system model is specified in
terms of its impulse response gm(t) in the time domain, or Gm(s) in transfer
function form. Once the system model is obtained, the shaping filter profile is
determined in the following manner: 1. A required response profile is specified.
This profile, denoted as gr(t) (Gr(s) in transfer function form), is simply the
desired or ideal impulse response of the system. Specification of the...